Buried integrated sewage treatment equipment is an efficient and environmentally friendly sewage treatment equipment, which is widely used in sewage treatment in urban, industrial and rural fields. The process flow of the equipment includes the following steps:
1. Pretreatment.
The pretreatment stage of the buried integrated sewage treatment equipment is mainly to remove large particles of impurities, floating matter and suspended solids in the sewage. This stage typically includes treatment units such as grid filtration, grit remover, and primary sedimentation tank.
Grid filtration is mainly to remove large particles of impurities in sewage, such as garbage, branches, stones, etc., to protect the subsequent treatment equipment. The grit tank mainly removes sand particles and inorganic particles with large specific gravity in sewage to prevent the wear of these particles on pipelines and sewage pumps. The primary sedimentation tank is mainly to remove suspended solids and some organic matter in sewage to improve the effect of subsequent treatment.
2. Biochemical treatment.
The biochemical treatment stage is the core link in the buried integrated sewage treatment plant, which mainly uses the action of microorganisms to degrade organic matter and convert it into harmless substances. Treatment processes such as activated sludge or biofilm are usually used at this stage.
The activated sludge method uses suspended microbial flocs to treat sewage, and provides oxygen through an aeration device, so that the microorganisms can fully contact and mix in the sewage, thereby degrading organic matter. The biofilm law is to use the sessile microbial film to treat sewage, and provide the environment for microbial growth through the filler carrier, so that the microorganisms form a layer of biofilm on the surface of the filler, and the organic matter is degraded by the microorganisms when the sewage passes through the biofilm.
3. In-depth processing.
The advanced treatment stage is mainly to further remove harmful substances and dissolved ions in the sewage after biochemical treatment, so that the effluent can meet the discharge standards or reuse requirements. Methods commonly used in this phase include filtration, disinfection, and ion exchange.
Filtration is mainly through the interception, adsorption and biofilm of filter materials to further remove suspended solids, organic matter, ammonia nitrogen and other pollutants in sewage. Disinfection is mainly done by killing pathogenic microorganisms in sewage to meet discharge or reuse requirements. Commonly used disinfection methods include chlorine disinfection, chlorine dioxide disinfection, and ultraviolet disinfection. Ion exchange is mainly used to remove dissolved ions in sewage, such as calcium, magnesium, sulfate, etc., to meet the reuse requirements of different industries.
4. Effluent discharge and reuse.
After the treatment of the buried integrated sewage treatment equipment, the pollutants in the sewage have been effectively removed, and the water quality has been significantly improved. According to different treatment requirements and treatment standards, the effluent can be discharged into natural water bodies, or it can be reused as reclaimed water for agricultural irrigation, industrial cooling, road cleaning and other fields. When reuse, it is also necessary to carry out corresponding treatment and testing according to the specific use to ensure that the water quality of the reclaimed water is safe and reliable.
In short, the process flow of the buried integrated sewage treatment equipment includes pretreatment, biochemical treatment, advanced treatment, effluent discharge and reuse. Through these stages of treatment, pollutants in wastewater can be effectively removed, water quality can be improved, and discharge and reuse requirements can be met. The equipment has the advantages of high efficiency, environmental protection and energy saving, and is one of the important means of sewage treatment in urban, industrial and rural fields.